TESTING AND ADJUSTING LS VALVE OUTPUT PRESSURE (SERVO
TESTING AND ADJUSTING PISTON INPUT PRESSURE) AND LS DIFFERENTIAL PRESSURE
TESTING AND ADJUSTING LS
VALVE OUTPUT PRESSURE (SERVO
PISTON INPUT PRESSURE) AND LS
DIFFERENTIAL PRESSURE
*
Hydraulic oil temperature when measuring: 45 - 55°C
Measuring
1.
Measuring LS valve output pressure (servo piston
input pressure)
1)
Remove pressure measurement plugs (l),(2),(3),
and (4) (Thread dia. = 10 mm, Pitch 1.5 mm), and
install oil pressure gauge Cl.
j, Install a 39.2 MPa (400 kg/cm? gauge to the
servo valve end, and a 58.8 MPa (600 kg/cm?
gauge to the pump outlet port end.
l
Oil pressure when travel is rotating under no load
on one side.
i) Set the working mode to H/O mode, and set
the travel speed switch to Hi.
ii) Use the work equipment to raise the track
assembly on one side.
iii) Measure the oil pressure with the engine at
high idling and the travel lever operated to the
end of its stroke to rotate the track under no
load.
Run the engine at high idling, operate the travel
lever to the end of its stroke, and measure the
oil pressure when the working mode and travel
speed are switched as shown in Table 1.
-able 1
Working
Travel
mode
lever
l-
H/O mode
Neutral
HI0 mode Full
Pump
pressure (MPa
(kg/cm*))
3.72 f 0.69
3.72 f 0.69
(38 f 7)
(38 f 7)
8.82 f 1.96
(90 f 20)
Servo
piston inlet
Port
pressure
(MPa
(kg/cm*))
4.41 f 0.98
(45+ 10)
Remarks
About
same
pressure
About %
of
3ressure
-
Cl’
20-44
0
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